Hey metalchips, I finally swapped over to the correct oil pressure sending unit. My gauge reads about 42 pounds at idle and 60+ when I get on the throttle. That tick is still present only when the engine hits 200 degrees and above. I'm still under the assumption that the o-ring on my pickup tube is cracked. It seems like if I keep the RPM under 2500 and drive the truck easily the tick doesn't become nearly as noticeable. I will be changing the oil and filter to see if I have any luck with a different brand/weight oil.